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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc3741642a1346485c743155e151927676cd5217a50c841b785a0d0245ad012' 
  AND token = 'braHsybWSDGMNbd6oqrfjlYpZQeBt/O7heZa5ib2BIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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