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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6097ee21d65248b9be4507e4ed3e740c3958ba531d2aae4fbbcd75602b5ee7a9' 
  AND token = 'ZvMVYsWj2iTyo2LntexicDZ3CYUi94/M22/A1BW+YLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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