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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608eb679cbc12daef78a4e73f165f6d4c3e167bd34d17f6a543cb50745c21626' 
  AND token = 'bfulpdWTVUai8w8Asx9fCwqPqwyrC1bSQA5wD/nt61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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