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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd119811c92c37c61bae29214bce75084913f57219d0c9c3794ecb48cb5295a09' 
  AND token = '7FnvsqGc+izDP9t1Bn2Ati+NpPP8glwL/mFf8eXhSE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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