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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec26d816f555bd801a72b799c324e9bb63934d3ae841e1975fe11ef7b8dca4f' 
  AND token = '0qQFj+tFHTaVNG+zU9FY4rzFbVQ3C4rXtViV9gfgPdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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