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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af454dd14e4df5b713880efd48cd0ff6b83a623bc5e896ed1008721c8c6b1a8' 
  AND token = '/6Kddy0Ps++5bRnbIgChaJsODbvjCU3J3qBt78Pbp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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