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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdde2a5d06ef01e137a74a190e3a58bbd0c35a46aa9f652b9dd56c9d934a4763' 
  AND token = 'GXMIhj8NhfzHcm3XFhwUuqgXbyhrVUE3OoidlnOHkAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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