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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f6d77c714e7be57419e297e7befcd8583f96d95cd0e1d9cdb214bc4a1529b4' 
  AND token = '7nT6ynKKGd/alK/zPHLiYuf4CEOujzhTc/Eni5biTNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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