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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46847550024d26812d52779d3090c0b14dc8fbf4676eb45ec8b9f85f75ee95fe' 
  AND token = 'lQGnKMXH+v7LmL5AY30G2u+C2iycKry2oAwpGdqcNIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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