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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae625d3ad17899406b6bc6c1ee403f0646f4063ff2c4ac69e6e02d24bbfba59' 
  AND token = 'TfLv96IBm7cgM83VRHLdRZwa5wMQjVAo27MjI3Ixv7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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