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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee55e92b69c15f475ecf55d042ef7ec57c9ac436b2578ba9a54c3eddcc0cb8b1' 
  AND token = 'tS30/4Rw5HNEWkBT7oj39YxzCzjTII0g+rnNoxtL550=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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