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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a61c0c0e7cb92715ba23b32b6e17fcda44ac6cd103f67d11a0a7b0676a4de8' 
  AND token = 'avvBP7JXlZIJpMRYoLEcqoMfgtgMBqO+Heinbjw7IQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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