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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b078041d1d394040e33713469f7b4b75ed63c5c497a40f0d46b6ee245ebc4b1b' 
  AND token = 'x0gNhZuWHxxIN4nG85r/hOkRU0Z3tQyiu7hatEy8A/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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