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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd6f4b7c13ca9c741530acc40ddd013487512073bb8576494ba60b05c84e25a' 
  AND token = 'DN9dl/5bZ7KkViMOlMp3ADyBdnrkbGbKGfGLMrzr29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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