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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633de7100b5207de5c62c976a6ced2af59e95c01866e1352c3dd2946332698b1' 
  AND token = 'j+a35LeH5Qot3hYRQuGpogLKSNkv2oekNV4E78zpyVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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