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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a0c93f3e03f16a9a33ab7a3496bc2e404d4a1303454d9e70d721174a0cf61d' 
  AND token = 'eyFze0769a8uaTtwu5e+0iPmu9hNlod3860mV5D13w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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