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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a654a08a4f71d6950d463668ed04c0310fb41c1d36608fdcf743eb3a469bbfcb' 
  AND token = 'n+C//qPo8aIlIX5+6hhXpJvPgXuuBrOIfuJC1LJfhaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}