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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f642ef693e97271ef346cfe6e7040ef86d366582d6662d3aaa4f6e9be62305b2' 
  AND token = 'QH7gLUYjgaO1IK3g23FV3NB9L2dUCmMUX9iFRszBcvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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