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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397ce3d0b93c48badaf8ce585cdc9c77aae13ebc41dc546c06a61b09b8512686' 
  AND token = 'zXs0zGu6tYMDugv7NFvHWvhpiO+IftEiJHLXaruPNmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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