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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa00459af48aa7134e7a4a3506800ce394589bde5e899410d242a0e789399e0' 
  AND token = 'lHe+7rXzjn6CO4y/z6KF0WjQO5gWp8rPBMOZ3DGHVjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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