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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e3287d7a70ca369e4af88f7e4f0f66ab10d9ea3d698fd4ee1d1d25b2ee71ef' 
  AND token = 'UiwyVLsYL9PMLJkCkdTE5uGWZhcmlRIEeLJKjkx1oGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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