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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823aaf2ab947c41ced2310e7aec7f9b14621dd1078248403f98f04ca651377f6' 
  AND token = 'zGIWczEfQi9H/YT04L71rDPJqFpj1eorwh37TTW2s/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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