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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5540d0c1e10ac4ab11a831b46960dc4d1e7bae9ff6433b87a8d1e3c0df034694' 
  AND token = 'H4M0EwnKI0tOcT8W6X10I0hFdf9BS3LkgpjGTo6BgF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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