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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2483951a03b4a458419a20ccb1db40d4b46b499120e960c3a3351e3ad7c7f08e' 
  AND token = 'Qv7t1u2MNu2fC7yDMX1HwtGqY/WJjxocWc0tD9C8y9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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