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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc496f5d32f412f8ea14474f82dd6dbfbd8676458ef17343543b144e24c455cb' 
  AND token = 'lubGNIxcZOmza8dratWAbZed/Z0r09h97y0WQsy8N0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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