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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e06c9d934f55288594ea4744a84f28f8d86e727e40fd87a09b2f9ae8a56c83f' 
  AND token = 'q1xXJq4PrPYBFz+H58gO92lorU/hY99fJbLUxqfgTNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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