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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d84582aa3afbadf87676be93c982535a826ff12a9dbd23966bef2e6069da00' 
  AND token = 'Ud9b1xSwjPF+j7sTezwtw6hZh2Q+PzUGjYgb3K3FmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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