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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d9b4b12d1fe47657dc07e1db3f93420e2a876f89e41b08232033ecf4d4839f' 
  AND token = '37knrb7XP+mBqVoJEnGqWmVGz9yyQaViPGFZV/THNe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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