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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308663d1d5d6d16593ad8d7dad1cf140519324ffca4f340af6988c8eba889587' 
  AND token = 'psUP8F4XDryrlflrfqPYs7c76HpDCPTE4Q9oNnZ58RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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