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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df655682075baadf82c5692de97234246fff586bb8c81e7ffe449e4f272d60c' 
  AND token = 'cpAiOLG/NNpxG5okOros97YMMfSZDJyx5r/4HftAg8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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