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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d03c0a1a04445fd0591ec590ebbe46f25bf852cbba20a822d7984201a7ded3' 
  AND token = '8y1VQOlm4JsJ8e8yluI6TrGt/dtrDdziRkAJ2agRP4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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