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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ca2e9c6941e231d0fc1510f8b7e8f05e49d5f8caa6bf877b4bc19b5fdbf0bf' 
  AND token = 'eDhainBjTZSpSCJGdCjXSPHvKu/6wGOaARcZM2scXS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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