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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e241d13e0eec3404280c95ed772ad701a60ab3a1ad7897a51472f50f76d7d88a' 
  AND token = 'mlrQiW+oas6FKtUkw2BMEQchuhTwA0UDiWPBuF7luXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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