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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88589e5e17b8d7d2881432eeab166adb3717093594a2cc7b2a372b60c064a41' 
  AND token = 'LhM8BU0UP22dQ/VsTWh+8iSchIixbymmuQ1pVFv/K3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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