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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8787ece48010af19b0bc4393de7e53ffb1e01025dc601823a4b5780b9ceb90a' 
  AND token = 'LC9lQkcYZj0hQsd0icbn7awx7Wc72wgSs0veBw7zG/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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