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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466bc329d7971e681b88b30081d0b990ddbe6da8f0967be08d9b3c57f335648e' 
  AND token = 'Rh8bHhSvdalUOEa6gURRpjSLJ6+hUJqHXbXJW8p3bUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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