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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b51531088036ed2d1ffbe6fffede1bd0ce85a42bb240e151d48f1783b970ad' 
  AND token = 'MCF9z7XeJawP75TNJAqgfg0wn3MLtMCAcXJc2FM7glY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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