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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c2319baf5568e0f13d51000ed2be3319eba4e1ea693d5400fae3b8ae022056' 
  AND token = 's9BPTb/QKKgO6NXgdjzg+zGRwj5tkBO8Rtvcf4KvY78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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