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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eec33c3103030734c8065104d85f97970337e22d69a345c9883996604887fc1' 
  AND token = 'pC1VGOofCBAl1Y0nkzpzwA7Bo6+q+yg5l0I+PtI5hbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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