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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7956987c9e43698cb0f58a89baeb16965fa6cce88e4087effb623d1558b12d' 
  AND token = 'B05d6VcnZY/rGzE8LYptDJF/R6bFo22f2uay8BdQcCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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