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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031630e0273b8c5a397a97832ed4ff7819cfb592374b6d99d4875529dc346380' 
  AND token = 'UxoW+m3wkcMze2n0LdUrDNH4iz1PsFUyJ/kO0MMGQZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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