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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e3f1769e7440e6d8198a0eb6a5e0ed05dfbf1bed766c2f503b3c3579054562' 
  AND token = 'aWpQw5pPoNM7+uvloT76xcj/PJzYjD8l0lbc7c5ONpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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