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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaad9d545a7f1e1eb653a9c667295b682b81012850abbc8f5df38e1e0e73d763' 
  AND token = 'XHiUtvYtmijdejvf67xtjH718BKBiWhN+IEmzQJLEGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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