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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d1eb24cd0eda0aac631f04b1bf8eb7290c066147e69368dae629a03d569426' 
  AND token = 'iaaPNWR9ai+V5V1k5DlukmoMBij6fxHdVkea9ci8Z3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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