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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9086c8d932af88de71753eaa0b268f6053d85dd35a4e120e8aca65c6cf3bbc34' 
  AND token = 'uF5FVfS+X8Tl1ucvNcTEs1P+ciLjRun9Q4o5OYZxZWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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