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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6652d8b42580f658579fd167c567eee9a154f5c3bb7199fa91b2b0ff80f2edc' 
  AND token = 'n/QoNZczBv3GGFSD05qmavBtVDIlNcv7MnPrhBTsEAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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