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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b8f742a83663aaef750665d991e1ca5b600f976567eeb7177fc8d74a35cc4d' 
  AND token = 'IO2wpmJ67QNLe9o5ELrZGgx5RGvfmrsZoqqO4ScyV+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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