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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebc97c36d805b408943a0e90d4726503663dbcb34df59decfe3b10af134943c' 
  AND token = 'GDuxcF5ka8nRzzPNxHJrj630ZBrDTbf/u5dHLqxRP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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