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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd122ab40d2b5967e451f50a93c6fa41e1bef9a1f8e71fb119cd2b19dc3a37480' 
  AND token = 'h6qv4IdqMT7vYSWGqaup0iV5e3K1XleFgGHNM3JZeOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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