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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb9537fb8015b8aa5bd3e9ff908f64a714fdb87c799ab19d9a5c55ed9ebdca1' 
  AND token = 'gSvLIFTyepYQCkrbPM/6Y1ZmMTt4Ot0HARRSgSLoLcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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