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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdeb8a6a048b3fa0eec9f55d3d1331eefcf512020ef32efb7c471e5524f1db7' 
  AND token = 'homOrmxMJyJhVifN/NFIUy6IfAgk0oMVqaRtKsqdVYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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