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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7df1f1e2aa7e53206300fdeda6b5f03f97ee1404b050234f78b6a5cda2c2985' 
  AND token = 'wwOfxfM7aLBT2Luj9xZzf2WbUG3b1qVpI3AuaUC2/W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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