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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994246a1b74a5176720b0dae0fb03de63ef01c6795e89385680ec1b828716a27' 
  AND token = 'ki2in2cqHuXJwojU4uiQMh9arX3r+8X4/clBc6tZkCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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