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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7760aa123f94cbb67fe179b1b93d812b2a5694a0d7264ff2869891bc50574a1d' 
  AND token = 'K2ccoDHOcZJ7tL0nFdeDVuT9LavEoMgUZg8WweYKOZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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