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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998589e83ba9b0186a41ebbd4666b0af65581e37db9c08afbee7cb9d130df022' 
  AND token = 'q8PFC3mwk8OIU7eNdJ3lz4N7u3L3EdDWLyVHK1NavjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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