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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b16f9b8be9c0c253d65b89bdee106c1c0811a3a452a252f9a9459df2d28c12' 
  AND token = 'HXV2foBOipoC2lj4LPSkECAUAxutsNvnrdB+Y5mc5rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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