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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4610bc8f4ae232bf082b79a4552601f619fade90980c06f153b356da9fbb8a00' 
  AND token = 'sU5UbEJp/L+S8QDYDm9T4qTiGF12aJUGiSYRKI5KTTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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