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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3d13f56656e859822f5cbb1a193f04ef62b378ce30d61c41f0bf75e8194a27' 
  AND token = 'lVTt91UArKAplCPqCRJuOkM6RoOA7d7iQZwBzry30B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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