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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d151975a49911285f010899ddaa6c18aa7d7c14ddb0f9bdd6c0e8b97404ac8' 
  AND token = '2oEwmks9ODvP5gg3jM6Dk/DNRjattNOu2q17sN5FX3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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