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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cb8ba3b6bef46cadab8e80defc7874fe7bdaf5ef7fc74be5e8f077e9a9f6ac' 
  AND token = 'cfdR5fI2RAnE/kZMV7SdhnN4ISz8GVNpj+WKHUbr7nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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