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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c72485f7db9d6b99c1a7fc53eae9e17f8ce1a46a188a2bc5a23b48dead0b5b7' 
  AND token = 'LwVI5tNzhJnX246uI6rRQV8OsKArkj2LF8qIemhGA4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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