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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5ed4cb953403a8c0b3b61f18240751a29bdc564f95b50f27f3c8a5a0ba2c04' 
  AND token = 'dQt1jc+VUwZkh9Fa+MsOiA0iHJyPbmeLPFfM9HFW5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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