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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69776729192396172ddb2cc4781d4b7eede5a50706fece4756079dedb5e476c8' 
  AND token = 'tYozRHyFwIXBFp9z3YhN5EY9LOWEGMkluTll0W/POxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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