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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfe50d9b8701e8e6aab55719a198a50b55fe118c3f00fb6c503ed6f061b8120' 
  AND token = '9BZSeUTwZCwgTR3jZgtiIdDhmrPcDPHKPgAcylGH+7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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