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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88227034f9e4464830bd05e67a9e7da98fd0633ad78220afe178966546a05eea' 
  AND token = 'ng87IWCQd5cun2dfxDkU8Nvk93GmQ3dYwjye9pOYeF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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