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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab96001e7879bdc6d89a47777fad997c2a8c02740108a6bfddac6e1a96801858' 
  AND token = '0bRFKuQZCs0A9pQjae5AqVHxXKYggLVMxUDO0/1OLwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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