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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c79d6e3d766eec116451fc61c1c2a0ebae1ad8f727a86964aff726d1203f5fb' 
  AND token = 'sGOQIZ5YebxqICQom/rPucTJ4oz4ZmyhNljPaAUiBZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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