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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a51641578f3263b291ebd829abb23a36dd8620dd3daf0e67bc2d8917920faf' 
  AND token = 'TgpBP6DzSD8j85Cwxrp6lfU6q0wLVf6+t6dZUznELew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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