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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae90b5b14ccdee0ff93deae8e4df2eb2cbaf9f78d2735d95c09b219a1dd40e9d' 
  AND token = '5czeW+jQhSdQzdOw/iqX02aCNl3IVkQmFvfkAO1XQIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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