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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a2b2a2ced578ff1a0038596856a807fa346bf70c9b8c65f307509a9625cd6d' 
  AND token = 'q529GPQxGkiA/SrAirSPbd6jq8/2Af9OXodnqjcg9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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