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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054ab059d80955ae8af986bb3ae2b43137a6fe5b6351ba448c115721775d5207' 
  AND token = 'UPo8D6f6wvObd8sZ3rpbLTGRrEmMMuZurfusKKTpeig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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