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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b93e6b05b03eee899f6a51a37c991f6243d6233b348ab7350ed8c1ad63dfe9' 
  AND token = 'IWYkILFuFFRu5FRozjb80bJzcdKJGxpi03D5RhM4bDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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