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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdad4b0ad80bbdbbeeb61f6207fafe38482914416937cc01e228ff35874e22d' 
  AND token = '83Pw5rG3s1wkToqC89O8axBBUlt2axfVVK9VrWD4KY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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