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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6168adb48841cb7757477888dd0a2d34133865bcb9de632678dd9992d40ef0c' 
  AND token = 'iewvk605L4Bs+a+1G7yy5Ei6LI/2RLrrBWS5g5ji9lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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