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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0a4f1ccc0842f847bfaa083b181bc95320a467bedc71ae61fde7577dd19cce' 
  AND token = '6e2NrZR/kWty7bOyHgy9RJKHzeh66/4gtt6SAH30O4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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