SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650188e125949190989a459f231f7611a10c2cd19f89a84d3b9cc34c8c96570e' 
  AND token = 'gGQp25+zC3+XG27/BIhmIljcOxVHppykfX0vQ1wCmxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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