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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58bf0ac6ddac0ea70a5c0be17a71ddaa3abdecc688393cc6975e65a1e679d98' 
  AND token = 'pf2Lm3+qq3M4QZOz8exNTd7/aVbrY3PeViSgur4yz0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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