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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10eebe35aaf93d5172568b08579c7e370890e300c4e76f2f17072d9acf6deac4' 
  AND token = '/pqr2UaWMmNiN9HVF9nIwKwmK+m6H6tFumtkgpniq/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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