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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff40eed733a26a9ff38293b7d44f25a9dc3cbf0bdb6c84c30cf7d8a9082be43' 
  AND token = '93o/2FLDrEv+hwLTrzlVjnKbLCogkrQ7yhHMd6+53AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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