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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df5fb82ab031dad087660ef4eaa9e9da98cd856b85ff580a101f992e73bc95c' 
  AND token = 'kqXHxBhb6xTLxH0Vk2TjcXTjxFdvSiARglynRWdn/oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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