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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4c87516158bc04496921211f4596070ebe40451968d08e39265991745c7a0c' 
  AND token = '1ub/xJod9DNZE3tyv5Iy4bNdzMJJmyJXGG0utl03AyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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