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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d76929838c217ba213914b687fa1490f34ac3ebff483fbc7f44d259e4db4c7' 
  AND token = 'kM1O57YxgsIRxtmmbpl0cNbIzIhHGD41OcauQ2wu408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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