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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df718ab38f319e4d8dda68eee41d158686a9c232eb7cbad39177be4e8cef1b5d' 
  AND token = 'hwe1jp8LBFMATNT36YS7js0ylQQNw30b0+QdzsAnygE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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