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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e81ae365596896c1c099421a281c53abb8d9ed7b52995212b580d9c735c2c0' 
  AND token = 'oYg8B5tFuSngkWaGJnWsr3WTtKWGOIh75dp5OysSFJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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