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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2e4bb06cdc534225cdca798ac9b46c9a6f051898c3dd4297b8bdb1e4fc0bda' 
  AND token = 'j9MuDIThe4Ws5l12lUBClMghAi151iAr6O27cOLUdnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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