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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dd11cc3a2b6e78ba3a7e06106e729d959d8867a2a43903f10685054267efc3' 
  AND token = 'kMmMikOFyGSDv+71RfGdTfwz25apC4I29/oMKQVGCtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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