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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ac71cab141e7f16e73492483d1eff7000842db1dd9986ed3e096c9f55ce2d2' 
  AND token = 'mgCHeMNP1qrm3dGnuCSii5co8vK5AgFIFlQN1aCI/fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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