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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdbafab6abc1e47c77b8b50f8df4f1d6af17e89a2895b4faef85a2b26109584' 
  AND token = 'DjuQI9q3m1DGFarT7LwprAs7/EsndN1mkA4FpooOdvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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