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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8c27271f6f3e319ce54a661ae9ff5608d8c6e39dabcfaa4a81c87ec3477aae' 
  AND token = '1oOZHuC2Rwovubqfbb2tNq0LYnJl/7fX6ZNZ4bD6+v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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