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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3ff41bbcc1bc86162a62fed0a7a1ba853720e1ae3c8d8fa6d72a0418bef2f1' 
  AND token = '8s5srHvh2uR4sNFnIX+bW8YVX5qN8jOJ28eMfiSJ0PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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