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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa90d54c333759e949a7ad53227e9cee2f6697e848494680d67399bdfdf7d12f' 
  AND token = 'QkWxIWTIzfRT08VKEKQIysasCnTfC6ko/yF7Wu4a4mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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