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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2304176de4ea0e33155c3a2c7455202c6690bf6047c3300aafb786baf7e322b1' 
  AND token = 'MEVgCt1CobOysitfWkPPY1sun4NM1vhvHRVsGgyHnR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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