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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2647310e544a3a75180e100f0caa775e3e1d09ba897b13dd7b4f086dbbd9470f' 
  AND token = 'IErCBFVZ9lpa3UxODXbj49iz6yxZJV1ZHRaMln/s2l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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