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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ccfa1c1dd94a58d339dba1baef34d80fa7b888023c6901eace059c9d28f87c' 
  AND token = 'IIdx804dL466xFKMZY7IhANh8H8ErxMKRgsx0+i3dws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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