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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083603f5bb8a1ae03b38b4bcf7e1634b305aac7143321fc8e36c753be8aa31da' 
  AND token = '69EZ2z02ciey6eWxHwVHpJVOoagxhvTeke12fq6ZDBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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