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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e36b1ae0c663ba8b6fa1fa8b32ef1444091e199089831516e5835e2400b3e2f' 
  AND token = 'bBpYHGfEYO/6bdus4QcRH8FTE9XAgzuWX0Gvu91BMnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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