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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289fbf3c5bb3c2e522347899c7fca3de114531a7536d2aedcc7aceb7a7d72ebb' 
  AND token = 'UGC6D1FlFnLqKkABMJNpcrZQaNIEiICzKceEJyVcvLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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