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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9864c3d0372d67ede69b59396f383f266331c6693b7b66cf846ef04cfedbff43' 
  AND token = 'hH4DnpDT7EQrhxjsgGlq7V6cHiOggl2LwET8nA65XPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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